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Finding the Fourth Proportional to 30,611.75, 45,917.63 and 12,143.75

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Solution

The fourth proportional to 30,611.75, 45,917.63 and 12,143.75 is: 18,215.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,611.75 : 45,917.63 = 12,143.75 : x
  2. Step 2: Convert to fraction form
    30,611.75/45,917.63 = 12,143.75/x
  3. Step 3: Cross multiply
    30,611.75x = 45,917.63 × 12,143.75
  4. Step 4: Simplify right side
    30,611.75x = 557,612,158.59
  5. Step 5: Solve for x
    x = 557,612,158.59/30,611.75
  6. Step 6: Final answer
    x = 18,215.63

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.